NCI Dictionary of Cancer Terms

The NCI Dictionary of Cancer Terms features 7,804 terms related
to cancer and medicine.

Browse the dictionary by selecting a letter of the alphabet or by entering a cancer-related
word or phrase in the search box.

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A disease in which the alveoli (tiny air sacs at the end of the bronchioles in the lungs) are overgrown with fibrous tissue. The cause of the disease is unknown and it gets worse over time. Symptoms include difficult, painful breathing and shortness of breath.